Eeectbic regulation



J. L. CREVELING.

ELECTRIC REGULATION.

APPLICATION FILED SEPT-29.1911- RENEWED OCT. 30. 1918.

1 ,306, 1 74:. 1 Patented June 10, 1919.

INVENTOR UNITED f STATES PATENT OFFICE.

. JOHN L. CREVELING, OF NEW YORK, N. Y., ASSIGNOR SAFETY CAR LIGHTING. COMPANY, A. CORPORATION OF NEWJERSEY.

HEATING AN D nnncrnrc REGULATION.

1,3oc,174. P

- Specification of Letters Patent. Patented June 10, 1919.

Application filed September 29, 1911,.Seria1 651,896. Renewed October 30, 1918. Serial No. 260,375.

To all whom it may concern:

Be it known that I, JOHN L. CRnvELINo, a resident of New York, in the county and State of New York, have invented certain new and useful Improvements in Electric Regulations, as set forth in the annexed specification and drawing, forming a part v thereof.

My inventionpertains to that class of electric regulation wherein it isdesired to regulate a dynamo or generator in a predetermined manner and has for itsparticular object to provide means for automatically thus regulating a dynamo.

As my invention is particularly applicable to systems of electric distribution wherein a dynamo is used to charge a storage battery and furnish current to lamps or other translating devices, it will be described in connection with such a system.

The drawing is a diagrammatic representation of one typeof system embodying the essentials of my invention.

In the drawing, 1 represents a dynamo or generatorprovided with the usual field coil 2, having in ser es therewith resistance 3 indicated as of the carbon pile variety, and it will be obvious that the dynamo may be regulated by proper manipulation of said resistance. This resistance 3 is controlled by the levert normally drawn in an upward diwith the 10, the negative side of which is connected .as by wire 11 with one end of the solenoid rection as by adjustable spring 5, in such manner to tend to compress, the carbon pile 3 and lower the resistance thereof. The

. lever 1 carries at one extremity a core of magnetic material 6 and thus motion impartedto said core may serve to regulate the generator. 7 represents the positive lead of the generator which is carried to. one side of I the switchS which is preferably of the automatic variety adapted to close the circuit when the voltage of the generator is substantially thatof the battery, and as many such switchesare known in the art and the particular type of switch forms no part of my present invention, one of the well known types is merely indicateddia rammatic-ally. From the switch 8 the lead? continues to one side of the switch '9 and is connected positive side of thestorage battery coil 12 surrounding the core 6 and having 'its other terminal connected as by lead 13 to the negative brush of the generator. .From

theswitch 9 the main 14 is carried to one side of the lamps or other translating devices 15 having theirnegative terminals connected with themain 16 which is carried to one side of a translation circuit regulator, in this instance indicated as a carbon pile 17, having its opposite terminal connected as by wire 18 with the solenoid coil 19, the

neto-motive force in thesame direction to 7 that set up by the coil 19. when the current is passing through said 'coil 19 from the lamps or translating devices to the battery. 20 is a solenoid coil in shunt across the gen erator circuit surrounding the core 6 in such manner that, when energized, it tends to draw the core 6 downwardly and increase the resistance 3. The carbon pile 21 is controlled by the lever 22 normally drawn in an upward direction as by of such movement being determined by the adjustable screw 24. The lever 22 is vided at one'extremity with the core 25 surrounded by a solenoid coil 26 in shunt across the generator and battery circuit. The resistance 17 is controlled by the lever27 normally drawn in a downward direction as by spring 28. The lever 27 is provided at one extremity with a core of magnetic material 29 surrounded by the solenoid coil 30 in shunt across the translation circuit.

Anoperation of the herein shown system comprehending my invention is substantially as 1 follows I 7 If the dynamo be running at such speed that the electro-motive force be suificient to charge the storage battery, the switch 8 will be closed and current will flow from the.

.cause said coil 12 to draw the core 6 downwardly against the action of spring 5 and increase the resistance 3, in such manner as to hold this desired maximum charging curprorent from being exceeded. If, now, the bat- I tery be charged at'this maximum rate until its voltage has risen to the maximum voltage desiredto have impressed across its terminals, I so adjust the spring 23' that upon any further increase in voltage across the solenoid coil 26 the same will cause the core 25 to be drawn, downwardly against the action of spring 23} .in such manner as to increase the pressure upon the carbon pile 21 and decrease the resistance thereof and by thus increasing the cu-rrent in coil prevent this maximum desired voltage being exceeded by the generator in a well-known manner. By use ofthe pilot resistance 21 operated by the coil 26, I cause considerable variations in the current in the coil 20 upon extremely slight voltage changes across'the coil 26 at such times as the generator tends to exceed desired maximum voltages and, therefore, ll

hold the voltage across the generator from exceedin a desired amount within ver narrow limits, and if the-battery be charged until its voltage be "substantially the maximum voltage for which spring 23 is set, the current in the coil 12 will be practically m'Z and the regulation of the generator will be substantially voltage regulation throughout speed changes. If, now, the lampcircuit be closed, as by closing the switch 9, current will flow through switch 9, main 1 1, translating devices 15, main 16, resistance 17 lead 18 and solenoid coil 19 to the lead 13,

thence to the generator, and as the coil '19 is wound in such direction that this -coil when thus'traversed by current assists the action of the charging current in the solenoid coil 12 and the 'voltage controlled current in the coil 20, the effect "of thelamp load will be to cause a lesser current to be necessary in the solenoid coil 12 or 20 or both in order to draw the core 6 downwardly against the spring for which the pilot 2621 is set there'will be little, if any, current in the coil 20 and the regulation of the generator will be ourrent regulation controlled by the charging current to be necessary in the coil 12 in orderto regulate the generator throughout speed changes and, the charging'rate to the battery will thus be lessened or modified in pro ortion to the'translation circuit load, whic in turn is affected by theoperation of the translation circuit regulatin resistance in response to voltage fluctuatlons across thesoleno1d coil 30.- Thus, it will .be obvious that the desired maximum charging current may be delivered to the'battery when this is the total load upon the generator and that this current will be held from being exceeded by the efi'ect of the coil 12 uponcthe resistance 5. If the battery be receiving its full charging current at avoltage below that tion circuit the output of the generator may be varied or increased 1n a desired proportion. That is to say, two amperes lamp load, for example, in the coil 19 may cause 1 ampere less to be required inthe coil 12, and thus the generator output may be increased 50% of the lamp loadgand, with this proportion taken for example merely, it will be noted that if coil 19 alone were operative, the generator output could not be increased more than 100% and thus protection is afforded. If the coils 20 and 12 be operating conjointly to regulate the generator for example in such manner that the maximum voltage is held from being exceeded by the coil 26 and this maximum voltage is causing 50% of the charging rate to be delivered through coil 12, then the addition of the lamp load will, through the effect of the coil '19, lessen the current furnished to the batload upon the translation circuit which is held at a lower voltage, as the rise in voltage across the battery would cause considerable loss in the drop. across the resistance 17 of the translation circuit regulator, which has the spring 28 so adjusted as to hold the normal voltage which may be supplied by the battery'alone on the translation devices 1n a well known manner. I

I do not wish in any wa to'limit myself to the exact systemset fort in this application merely to illustrate one type of system comprehendin the essentials of my invention, for it Wlll be obvious that wide departure may be made without departing from the spiritand scope of my invention which is as setforth in the following claims: 1.. In a system of the character described, in combination, a generator, a storage bat= tery adapted to be charged thereby, regulating means forsaid generator, a current coil through which charging current passes acting onsaid regulating means to maintain the current therein at substantially the desired value through a substantial portion of the charge of the battery, a voltage coil adapted i to act on said regulating means, and means adapted to'come into action as said battery approaches full charge and adapted to multitions in the voltage of said generator.

ply in said voltage coil the effect of varia-' 2. In a system of the character described,

in combination, a tery adapted to be arged thereby, said gennerator, a storage baterator being provided with a shunt field, a

variable resistance medium operatively related to said shunt field, a current coil through which-charging current passes proof variations in generator voltage, said last means comprlsmg a varlable reslstanceoperatively related to said voltage coil, and means adaptedto cause said last mentioned means to act upon said first variable resistance when the voltage across said generator reaches a desired maximum.

in combination, a generator, a storage battery adapted to be charged thereby, regulating means for said, generator, a current coil through which charging current passes act- 'i ing on said regulating means to maintain the current therein at substantially the desired value through-a substantial portion of I the charge of the battery, a voltage coil 4 adapted to act on said regulating means, and 1 means adapted tocome into actlon as said vided with means acting on said variable r evsistance to maintainthe total current in said battery approaches full charge and adapted to mu tiply in said voltage coil the eflt'ect of variations in the voltage of said generator, said voltage coil and said current coil be' I continuously in operative relation to sai regulating means.

4. In a system of the character described, in combination, a generator, a storage battery adapted to be charged thereby, a pressure-controlled variable resistance medium connected in the shunt field of said generator, a current coil through which charging current passes actin' on said variable resist ance to maintain t e total current in said coil at substantially the desired value, a voltage coil adapted to act upon said variable I resistance, and means comprislng a second 3. In a system of the character described,

variable resistance operatively related to said voltage coil adapted at the desired maximum voltage of said generator to come into action and multiply in said voltage coil the effect-of variations in voltage of said generator.

JOHN L. CREVELING. Witnesses:-.

AJNNA M. W M.v HERSKOVITZ. 

